Telautographic apparatus.



H. ONEILL. TELAUTOGRAHG APPARATUS. APPLmATloN ELED APB. 22, 1912,

2 SHEETS-'SHEET L IH'. W. ONEILL, TELAUTOGRAPHIG APPARATUS APPLICATION FILED APR.22,1912.

19179983@ Patented Feb. 2, 1915.

2 SHEETS-SHEET 2.

UNXTED STATES rlLtFFCE.H y

HENRY W. 'ONEILL 0F BROOKLYN, NEXV YORK, ASSIGNOR TO GRAY NATIONAL TELAUTOGRAPH COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F VIR- GIN IA.

TELAUTGGRAPHC APPARATUS.

Specicaton'of Letters Patent.

Patented Feb. 2, 1915.

Application filed April '32, 1912. Serial No. '33:2225.

To @ZZ who/a. it may conce/fn Be it known that I, HENRY W. NEILL, a citizen of the United States, residing at Brooklyn, .county of' Kings, and State o'l' Nerv York, have invented certain new and useful Improvements in Telautographic Apparatus, fully described and represented in the following specification and the accompanying drawings, forming a part or' the same. p

This invention relates to improvements in telautographs of the variable-current strength type, that is to say, telautographs in whi ch the movements of the receiving pen over lits writing platen are controlled by variations in the strengths of the currents on the tracer lines connecting the transmitter and the receiver, which variations in current strength are in turn controlled by the movements of the transmitting tracer over its Writing Field, so that the receiving` pen moves in unisonwith, and reproduces the movements of, the transmitting tracer. vThe present invention has reference particularly to means controlled by theV transmit-ting tracer for producing a vibratory condition of current on the tracer lines, which vibratory condition of current may be utilized either :tor the purpose of controlling the movements of the receiving pen to and from its Writing platen or for vibrating the pen-moving parts at the receiver for the purpose of reducing frictional resist- Aance to their movements.

1n the accompanying drawings-l4`igure1 is a diagrammatic view of a two-Wire telau'- tographic system comprising a. transmitter and alsoa receiver connected therewith, the same being equipped with the improvements constituting the present invention, which I are shown therein as utilized for the pur pose of moving the receiving pen to and from its Writing platen or for pen lifting and Fig. 2 is a similar view showing the improvements utilizedfor the purpose of vibrating the pen-moving parts at the receiver.

Generally considered, the telautographic systems illustrated in Figs. 1 and 2 are of well-lmownform, so that, except for the features constituting the present invention, only a brief description thereof Will be necessary.

Each transmitter comprises al pair of rheostats 1, 2, included in a normally open current-sum)lying circuit provided With a suitable source of electric energy, as, for example, a. motor generator 3, the negative pole of which is grounded at 4, ,this local circuit being controlled b v a master switch mechanism, designated 5 as a whole, controlling contacts (3, 7, S, which, in the .position in which they are shown, engage, respectively, stationary contacts 9, 10, and 11, thus completing` the local current-supplying circuit just referred to, and also the tracer line circuits connecting the transmitter with the receiver.

The currentsupplying circuit' justreferred to, which is closed by the engagement of contact (i with contact'9, consists of wire 1Q, from the positive pole of generator 3, contacts 9,(3, Wires 13, 14, Wire 15 to rheostat 1, and Wires 16, 17, 18 to rheostat 2, and Wires 19, 20,21, from rheostat 1, to

fnarily referred to as right and left tracer lines, are traced as -follows: For the right line, contact 25, arm 26, wires 27, Q8, contacts 10, 7, Wires 29, 3 0, right hand relay 31, vvire 32, movable coil 33, and Wires Bel, 35, 3G to ground at 37 at the receiver. For the left hand tracer' line, contact 40, arm 41, Wires 42, 4:3, contacts 11, S, Wires 44, 45, leit hand relay' 4G, Wire 47 and coil 48, wires 4f), 36. to ground at the receiver.

T he arms QG, Zl1. just referred to, are connected by levers 51,52 with pen arms 53, 54, respectively, in the conveying ends of which is suitablyfmounted the transmitting tracer 55, all in the Well known manner. It will be understood, of course, that as the transmittingr tracer is moved laterally, or, in ether Words, over its Writing platen, roller contacts 25, 40 will be moved length- Wise of the rheostats 1, 2, respectively, and as they are thus moved, currents, varying in strength in accorda-nce With the direction and extent of movements of these roller contacts, will be shunted into'theright and left tracer line circnits just described,-antl, further, that such currents of ,varying strength will cause the coils 33, 48 to move varying distances in the magnetic field proided for them "by the magnet '60, which magnetic field is excited separately from vcoils 33, 48, that is '6 0 say, from a local source of energy, as, for example, a batf v iii, throughcircnit connections which wal presently he described.

are connected in the well known .mam ne" hy means oit brackets 62 and segments 62 with .levers (la, the latter being pivotally connected hy pen arms 'which carry in their pivoted converging ends the receiving pen (36. Therefore, as the coils 33,48 are thus noved rectilinearly in their magnetic field, cccrdance with the variations lin current 'ength on the two tracer lines. the :receiving pen 6G will he correspondinglg moved ard thus reproduce, both in exten and direction, the movements ofthe trani mitting tracer laterally or over its writ.- ing field, all in the well lino'wn manner. Ot course, it will be understood that these coils 4S 'are moved in one direction by the currents traversing the tracer lines and that their movements thereby are opposed by springs, which, as the currents decrease in strength, move the coilin `the opposite direction. inthc usual 1 aimer. The circuit from battery 6l., by mea .s of which magnet is excited, contrlled in its opening and closing by the left hand relay 4G, the armature 7G ofvwhich carries a contact 71 which engages a stationary contact 72, when said left hand relay 4G is energized by cur rent traversing the left tracer line, armature in such case moving the spring contact 71 into engagement with stationary contact.

79, and thusclosing" this local circuit through magnet G0. This `local circuit through said magnet is traced as follows: wire from the positive pole of battery 61, wiresii. 75. magnet G0, Wires 76. 77, 78, contacts 71. 7:2, and wires 79, 50, and 3G to ground at 37. So long as the tracer line circuits between the transmitter and receiver are open. relay 46 being denergized contact 7l will he out of engagement with conta ct 72, this lrcal circuit then heing open. As`sron. however, as the tracer line circuits are closed, magnet 46 will be energized by the current traversing the left tracer line, and thus' bring contact 71 into engagement with contact 72, thus closing this local circuit. y

The apparatus as thus tar described provides simply for the lateral movements of the receiving pen, or. in other words, its movements over its writing platen. Means are also usually provided. controlled from the transmitter, for effecting movements of the receiving pen to and from its writing platen, and also .i'or vibrating the pen-mov ing parts at the receiver for the purposeof reducing irictional resistance to the movenicht oi' the receiving oen over its Writing surface. in the present case means, controlled from the transmitting tracer, are provided for producing a vibratory condition 'in the current traversing the tracer The coils 33,

line, which may be utilized for either of these purposes. In Fig. 1 they are shown as utilized for the purpose of ellecting the movements of the receiving pen to and from its writing platen, other means heing provided in such case for vibrating the pen-L ing means provided by the present invention will iirst he described in connection with Fig. 1, and then Fig. 2.

Referring now to the receiver of Fig. l, it will he observed that it 'is provided' with a pen rest mounted on the armature of the pendifter magnet 8G in proximity to the peincarrying armature (35, so that when said magnet SG is energized, pen rest S5 en gaging pon arms G5 will move and hold the receiving pen (56 away from its writing platen. while on the other hand when said magnet is denorgized. its arm-.iture will withdraw pen rest out of pcirsiuilmrting position, so that thc receiving pen will hc moi cd oy its resilicncv or otherwise toward and into contact with itsI writing platen or the' record strip thereon. The construction and method ot operation of peirliftcrinagnct 86 are so well-known that detailed description thereof here unnecessary. This magnet 86 is energized from battery 6l through a branch of the local circuit through which magnet G0 is energized, this branch circuit consisting of wire 874 from magnet (30. -the windings of magnet S6, wire 88, contacts 8U, 90 inclrsed in a tube 91,. and wires 92. 7S, contacts 71, 72, and wires 79, 50, 36 to ground. Tube 91 is mounted on an armature-diai'diragm 93 adapted to be vihrated hy polarized relay 94. and one of the con- Etacts 89. 90 loosely engages the other so that when diaphragm 93 1s soy vibrated, the cngagemcnt between the contacts 89, 90 will -be practically ineffective for the purpose of closing the branch circuit just described through magnet SG, as said magnet will remain dciinergized so long as the diaphragm 93 is not so vibrated, the engagement hetween the contacts 89, 90 will be effective for the purpose oit closing such branch circuit, with the result that said pen-litter magnet 86 will be energized. The construction of this relay and the method of operation ofthe diaphragm' 93 and the loose contacts S9, 90, are so well known that further description thereof is unnecessary'. ,One of the windings (95) of the polarized relay 94 is bridged by Awires 96, 97 across the right. and left tracer lines 3C, 45, at points on the transmitter side of the relays 31, 46, a condenser 98 being included in the wire 97 heifi-ences tively'A to each other, vupon which the energi nation and denergization of the pen-lifter? magnet 86, andttherefore, the movements oli the receiving pen awayv from and toward its .Writing platen, depends, is controlled from the transmitter, and by the Atransniitting tracer itself, through connections with theright and left tracer 'lines which will new vbe described.

Referring now to the transmitter, it will be'observed that it is provided with a shortcircuiting l'iuzzer-group,I comprising a inagnet 110, which is included in a branch circuit frointhe positive pole lor" generator 3, 'consisting of Wire 111, including a nominduct've resistance 112 and .tapped lfrom Wire i 16, wire 113, the winding of magnet 110, wire 114, wires 115, 116, and wire 117, includinganother non-inductive resistance 1:18, to the negative pole of generator 1n the raised position of thetransmitting tracer,

however, and, therefore, the raised position' .fort platen switch 129, fa shunt is iormed ar und the magnet 110, and said magnet thus reiidercd inoperative, said shunt circuit consisting of Wire 121 romwire 111, platen contact 120, stationary contact 122, and Wire 128 connecting, by Wires 115, 117', to tin,- negative pole of generator There fore while the transinittingtracer is raised its writingl platen, there will be bien ci the buzzer magnet 110, and no eliiect produced thereby,"and the connections hereinafter described, on the current ip; vthe right and left tracer lines, the icing theL the relatively loose contacts 89, 9 will eniain in elective engagen'ient to stain the local circuit through penliiter magnet 8f'. closed, 4fieri rest 85 in such caso being hel l 'oy said magnet in its outer or supporting' position soas to hold the recci ving. pen 6b away from its Writing platen, which is,'o course, the position, at the time, of the transmitting tracer Twith relation to its planen. `pon the depression -ot the transmitting tracer, however, and,

tlu-uefoi'o, depression oi the' platen switch 120i this shunt circuit if n at thecontarts 1.o, 122. and curicnt passes 'from gen crater 3 ough the magnet 110 vby Wires 111. 113. ,i if, 1.15, 116, 117 to the negativo pole e?. the generator. 1n *l y ois condition of switch-additional 1 are at the receiver.

vided for auton'mtically vand inte 'mitteutly short circuiting magnet 110, consisting of wires 125 connected with 'wire 111, wire 126, Contact 127, and armature 12,8 of said inagnet, this shunt circuit boing closed, of course, when, on thecncrgizzation of magnet 110, armature 128 thereof is moved into engagement with contact 127, current then pas ng from Wire 111 around said magnet until it becomes denergized, when its armature 128 will be retracted by a spring 129. th'us breaking this shunt circuit, and restablishing'the circuit through magnet 110',l and so on, said magnet being alternately energized and deenergized, and therefore, alternately making and breaking the shunt circuit, at tho contacts 127, 128. Through these contacts 127, 128, i inagnet'll@ which has high resistance and impedance, in turn controls the charging and discharging,.in series, of a pair of condensers 130, 131, the former connectedA by Wire 132 with the right tracer line Wire 28, beyond arm26, and by a Wire 133 Withv the Wires 116, 117, of the circuits just described, While the latter is connected by Wire 184: with left tracer line Wire 41.2, beyon'darm 41, and by a Wire 185 with the wires 125, 126 of the circuits just described. The purpose of thesecondensers 130, 131 is to cause alternating current Waves to traverse the main tracer lines from the transmitter to the receiver, and, at the latter, to pass through the winding 95 of the polarized relay 94. For this reason impedance coils 186, 137 are provided at the transmitter between arms 2", 4-1, which effectively choke oil' these waves at the transmitter so that they cannot pass through the transmitter circuits but must sie traverse the main tracer lines, while at the i receiverinipedance meansV are also present, consisting of the relays 81, 46, and coils 83, 48, which choke off these Waves at the receiver so that they cannot pass to ground, but must passover Wires 96, 97, and through' relay '94 and condenser 98 bridged by said` wires across the right anal left tracenlines The presence of these irn-Y pedanccs at the points indicated confines the alternating currents to a metallic circuit of lowinductance consisting simply of the tracer .line `wires and their closing contacts,

the bridge 96. 97, at the receiver, and the relay 911 which is to 'be operated by these Waves. Of course, `any suitable impedance means may be used in lieuv of those shownand described, and, in this connection, it Amay'benoted that no special impedance coils are provided, at the receiver, as in the transmitter because the. relays 81, 16, Which are present anyway, as local circuit closing means in the vreceive of certain `types of telautographs, may, as they 'are here, Vbe used as 'suitable impedance means,"oare being taken that they be suitably constructed to perform their .ordinary ifunction, and also this additional `impeding function and that they bear sueh relation to each other as to present a balanced condition which will not disturb the synchronism or symmetry of the wares traversing the circuit. The presence of' the condenser 9S in the line JG, 97, bridging the right yand left tracer lilies at the receiver and through the winding 95 of relay fl-l, to render said winding non-sensitive to the direct currents traversing the right and lcl't tracer lines, but sensitive to the alternating waves traversing said lines as the condensers 130, 131, alternately charge and discharge.

The operation of the condensers 130, 131, stated in detail is as follows: Assuming contacts (l, 7, 8 to be in engagement with contacts 9, 10, 11, and 'current therefore to be on the tracer lines, so long as the trans milting tracer is raised away from its writing platen and platen switch 120 is in raised position, thc coinlensers 130, 131 stand discharged'over theline circuit loop and the shunt formed by contacts 190, 122, and no vibrations traverse the tracer lines. finding 515 ol pen-lifter relay SJ-l and the diaphragm 91, with the contacts 89, .(10, are tli'ere'fore quiescent and the circuit through pen-lifter magnet Stia'emains closed, attract .ing its armature. which, through pen rest 85, holds receiving pen GG away 'from 'its writing platen. The instant, however, switch contact 120 is depressed by the tracer or the hand of th'e operator, this shunt cir-- cuit `is opened and direct current flows from positive of generator 3 through -wire 17, resistance unit 119, 'winding of buzzer 110, resistance unit 118, to negative. This circuit condition effects the automatic op` eration of the. short circuiting buzzer, as when the armature 12S reaches the 'forward position contact 1Q? closes and effects a short circuiton'the buzzer winding, dener'gzing the coil. The armature thus released returns to original position, by the action ot' the retractile spring 129. At this instant, contact 127 being open: the positive .side of the direct current source, through wire 16, resistance unit 112', Wires 125, 135, vreaches one plate of'condenser 131, and gives it a positve charge; the negative side of current source through wire 117, resistance unit 11S, wire133, reaches'one plate of condenser 130 and gives it a neg-` ative charge. The opposite plate of condenser 131 being-connected to left line wire 43 and the opposite plate of condenser 130 to right line wire 28, it results that when the plates take charge as above, the plates connected to the line wires Will assert themselves over the path havinglowest impedance'or effective resistance, this path being that circuit formed from condenser 131 over wire 43 and line wires 44, 45, to

the receiving instrument and thence over wire 96. condenser 98, alternating current relay 91, wire 9T, line wires 30, 29 and wire Q8, to condenser 130; Thus a positive impulse has emerged from condenser 131 and traversed the 'circuit described, being attracted to the negative plate `of condenser 130 which ,is connected to line wire 28.

y Now assume that the buzzer armature has again been attracted to theforward position, contact 127 being closed at this instant. The positively charged plate of condenser 131 will now emit an impulse over wires 135, 126, buzzer contact 12T, 128, and wires 115, 116, 133, to the negatively charged plate of condenser 130. Again this oppositely directed current action is possible` owing `to the opposite plates of each condenser beiner connected to the line wires as describedl above. For this impulse the line side of condenser 130 is positive and the impulse emitted traverses the line and alternating current relay circuits in the direction opposite to that described above for the instant of charge. The condensers are now empty having discharged in series one with the other through the connecting wies, short circuiting buzzer contacts, line wires and alternating current relay circuit as described.

Now, inasmuch as the movement to and fro ot the buzzer' armature 12S is very rapid, it is obvious that the condensers 130, 131 are. charged and discharged respectively in phase with the opening and closing of the buzzer contacts. rl`hus owing to the. circuit arrangement as shown, whereby the con denscrs act in series for either impulse, charging `or discharging. ii necessarily follows that the total number of couloinbs going out over one wire must return over the other wire. rl`his identical current condition in cach wire for all impulses, results in one wire exactly neutralizing the inductive ciiects of the other wire. As described, these alternating currents alect the alternating current relay armature diaphragm 93 causing it to vibrate in pl'iase with the alternations. This'in turn causes contacts 89, 90, to vibrate one relatively to the other, thus opening the circuit through pen-lifter magnet Sti, as before le.-1ibed. receiving pen G6 then moving into Contact with its writing platen. Assume the transmitter pencil. to be now raised trom the platen: Contacts 120, 129. close :ad through wires 121 and 123 ecct a short circuit on the winding of buzzer 110. bringing the'buzzer to rest, when the condenser action ceases, diaphragm 93 becomes quiescent, the circuit through pen lifter magnet SG is closed, and pen rest 35 moves receiving `pen (lf3 away from its writingplaten, which is, of course, the position, at the time, of the transmitting tracer' 55 'with relation to its platen. In this position it will ce clearly seen that the con infames verter groupestablishes a'balanced condition ot capacityr and resistance between the yand directly as 'theresistance and impedance or effective resistance of buzzer coil 110. v l Y The action of the condensers being instantaneous they'tvill charge at a. higher voltage than Would bey found-'byv applying ohms law to the resistance relation of the units and buzzer coil. This isaccounted for by the time factor relationv between the con-- densers 130, 131 and buzzer coil 110, the iinpedance of the coil 110 presenting, on the instant, a very high effective ,resistance The importance of the buzzer group and condenser arrangement whiclfhave been dev scribed Will be apparent from the following brief rsum: ln order to operate telautograph instruments of the TWO Wire typeover circuits adjacent to telephone lines as through telephone cables or vaerial lines, thetelautograph circuit must necessarily be a symmetrical-wave condnctor,'. e. the in ductance capacity and ohmic or eii'fective resistance of the two Wires forming the circuit must be identical. ln the telautographic system described, this balance is effected-by the impedance coils 136, 137 at the trans- 'iiiitter and the relays 31, 4G, and `pen moy'- ing coils 48, at the receiver.

lin addition to the above requirements it lis further necessary that the alternating current Waves transmitted must be symmetrical, t'. e. for a positive impulse in one .vire there must be a negative impulse of equa-l strength in the other Wire, as when one current alternation prodicesnthe same number oi Coulombe in each ivire outgoing on one vvire and returning oiftctlie other. As the twisting of the cable and transvpositions in aerial Wires give the saine surtace exposure for each Wire relative to adjacent conductors, it follows that at any given instant the extraneous induction set up by a. positive impulse in one wire is entirely neutralized by the negatively induced field ot'tlie other Wire. Hence, adjacent circuits are not affected. In order that the total number ot' coulombs going xout over one wire, for a given impulne, shall return ov r the other wire, it is necessary that these Aaltm'nating current waves ic ueneratcd or converted by such meansas will be entirely independent of the ground connections at claimed in my application :filed February 24,

1912', Serial Number 679,588, and is as follows.: The means provided in the present example consists of short circuiting buzzer, the magnet 140 of which is located in the receiving instrument and included in a I branch of a local circuit, fori exciting field magnet 60, consisting of wire 2&1 from said magnet, Winding of buzzer magnet 140, Wi re 24A, .and thence b y Wires 77, 7S, contacts 71, 72, and Wires 79, 50, and 36, ot the field magnet circuit, to the negative pole of bat tery 61. This branch circuit, with the field magnet circuit, is closed only when Writing currents are on line from the distant station, when, by the energization of relay 46, contacts 71, 72 engage. A shunt, including armature 2.46 of magnet 140,v contact 24:7, Wire 248, is formed, in thisbranch circuit, around magnet 140. lVhen, therefore, said magnet is energized and attracts its armature Qt, such armature, by engagement Witli rontcontact 247 will short circuit magnet 140. The latter will then release its armature 246, thus breaking this shunt circuit and restablishing the circuit through the magnet; and so on, so long as the local circuit tlirough field magnet 60 is closed. The Winding of the upper magnet coil 60 is in multiple with buzzer 140. It follows 'that this ivindingwill also be short circuitin which the coils 33, 48, are located will be maintained in a vibratory condition, Which condition Will be communicated by the coils to the parts connected therewith, so that the Whole pen Vmoving group Will be maintained in a vibratory condition, thereby greatly reducing rictional resistance to their movement.

Turning now to the apparatus shown in Fig. 2, in which the short circuiting buzzer group of Fig. 1 is used'for Vibrating the pen-moving parts of the recei/ver, other means at the transmitter being prbvided for pen-lifting or controlling the movement of the receiving pen to and from its Writing platen, it Will be observed that the right and left hand tracer lines from the transmitter to the receiver1 are the same as in Fig. 1, except for omissions of Wiring due to the omission of the right hand relay 3l. Therefore, the same reference numerals have been employed in Fig. 2 as in Fig. l, so far as the' tracer lines are concerned. except for such omissions. Polarized relay 94, with its connections, as Well as paper-shifting magnet 100, and local short-circuiting buzzer group 140, are also omitted. In the present case. the movement of the receiving pen to and from its. Writing platen is. as in Fig. i, controlled by a pen-lifter magnet 86, but here the energization and denergiza tion of this magnet 86 are eifected from the transmitter by a thir'd line or circuit 4controlled by the platen switch and stationarjv- Contact This circuit consists of wire l-l, leading from Wire 17 of the. current-supplying circuit at the transmitter, resistance 1.46, wire 147, platen contact 120, stationaryv contact 122, wire 14T, a stationary contact MS, niorable Contact 149, wires 150, 151, 132, nene-lifter magnet 8G, wire 153. and wires TT, T8, contactsl, 72, and wires 79, Ilo, 36, to ground at 3i' at .the receiver. (.ontaet 149 mores with the contacts G, 7, 8, herctolore described, and when these several coi ets are in engagement with thei-r respec .ive stationary contacts. current traverses the right and lett hand tracer lines to the receiver, and also, `so long;r as contacts v120 and are in'enganement, the neit lifter line or circuit just described. PenH lifter magnet SG is thus energized and moves its armature to such position that the pen rest S3 carried thereby will move and hold the rcceivinc ien .136 awa Y from its writinn platen, which the position'ot' the transmitting tracer with relation to its writing platen. lllhen, howeventhc transmitting; trac ris lowered into engagement with its writing platen, and platen. switch 120 is consce,uentljt,Y depressed, lthis third line ein cuit will be broken at 120 and 12:2', magnet SG thus becoming deinergiized and its arma.- ture carryingT the pen rest S5 away :trom pen supportingr position. so that the receiving pen G6 will rest against writing platen, and will remain in this position se long vas the transmitting tracer occupies a lilreposition with relation to its platen. ln this case the short-circuiting huw/:er group. including the condenser-s 130,131., not, as in the case of Fig. 1, thrown into and out ol operation or otherwise confrolled lo); the platen switch 120, but continues in operation, producing on the right and lett tracerlines the alternating current waves before referred' to.` so long as current is on the tracer lines. Except 'for this disassociation ot' the short-circuiting buzzei-group from the contacts 1,20, 122, the construction and method *ot operation of the short-circuiting buzzfaentn'oup and condensers in Fig. 2 is the .saine as heretofore described in connection with Fig. l, these alternating current waves. however, bini,r utilized in the case ol lfg. 2 'for another pose. nainelv, tor vibratingY the pen-movingr parts at the reccirer, which function, in the case oit Fig. l, was pcrforined by' the local shortcircuit bur/.zer group 1-l0 at the receiver. 'l`o provide tor such vibration' ot the pcnano'xing hars ol the receiver bv lucana ol' these alternating current waves, the bridgingr of the right and lett tracer lines :it the receiver by means of the wires 0G, 97. as in Filiv l. is oinitcd, so that these vibrationsl instead of passing troni one tracer line to the other, in

'advance oft-the pen-moving,Y coils 33, 18,1'lass from over the tracer lines through such coils, closing,r circuit at the common ground connection at the receiver.

What is claimed is:

1. In a telautographic instrument ot' the variable current strength type, the combi,- nation with the tracer lines connecting the transmitter and receiver, a source ot direct current. supply therefor, means, including a transmitting tracer, controiliug the strength of the currents therefrom traversing the tracer lilies, and electro-nnignctic pen-nior ing parts at the receiver controlled hy auch currents, cfa pair of condensel'is cornice-ted with said source ot current supply and with the tracer lines and arranged to alternately charge and discharge in series, one heini; positively and the other negatively charged, and ashorbcircuiting buzzer group emr nected with said Source o current supply and automatically controlling the. alternate chargingand discharging,V of said cov' lens ers, wl'ierehj/ alteriuitingn curreiit waves are caused to traverse the tracer lines.

2. ln a telautographic instrument of' the variable current f' rengtli type, the conihination with the tracer lines connecting `the transmitter and receiver, a source' ci' direct current supply therefor, means, inclodinga transmitting tracer, controlling the strength ol the currents traversing the tracer lines, and electromagnetic pen-moving the receiver controlled by such currents, of a pair of condensers connected with said source of current. supply vand with v the tracer "lines and arri-inged 'to alternately charge and discharge in series, one beine,- positivel,v and the other nog, tiely charged, a shorccircuiting; huw/.cr j" with said source ot current si and autoniaticall;7 controlli, 'c a i. chart.L ing and disehartg;ci; ci said .izcndcnsmf, whereby' alternating; current eaves are caused to traverse thc tri-.cer lines, and suitable iinpedai'icc means for diverting said waves trom said current controllinflj means.

3. lin a 'telautogroihie instrument ol the variable current strength type, the coxnhination with the tracer lines conneiiinnj the transmitter and receiver, a source ot direct current supply therefor, means. including a transmitting,r tracer, controllint; the strength of the currentsl traversing the tracer lines, .and electro-magnetic" the receiver controlled by such currents, ot a pair of condensers coniiectcd 'with parts at in-moving parte at .said source of current supply and with4 Llano-ea currents, of a pair'of condensers connected.r

With said source of current supply and with the tracer lines and arranged to, alternately' charge and discharge in series, one being positively and the other negatively charged,

2o a shoi-t-circuiting buzzer group, including a magnet connected With the positive and nega- Y tive of said source'oi:l current supply,for automatically controllingthe alternate charging Y anddischarging osaid condensers, whereby alternating current Waves are caused to traverse the tracer lines, and resistances interposed between the buzzer magnet andthe positive and negative of the source of current supply. v.

5.' In a telautographic instrument oi"- the Vvariable current strength type, the combiy 4nation with the tracer lines connecting the transmitter and receiver', a source of direct 1 current supply therefor, '1neans, including a e5 transmitting tracer, controlling 'the strength of the currents traversing the tracer lines,

andelectro-magnetic pen-moving parts4 at the receiver controlled by such currents,

of a pair of condensers .connected with said source of current `.supply and with the tracer lines and arranged to alternately -charge and discharge in series, one being' positively and the other negatively charged,

a short-circuiting buzzer group, including a -magnet connected With the positive andnega.- tive of said source of current supply, for auto- 'maticallycontrolling' the alternate. charging and discharging of said condensers, whereby alternating current Waves are caused to traverse thetracer lines, suitable impedance ineansfor diverting said Waves from said current controlling means, and resistances interposed between the buzzer magnet and the positive and' negative of the source of current supply.

I6. In a telautographic instrument of the variable current strength tgpe,i .ie combination with the tracer linesizoinecting the transmitter and recei\'e1."a'f*solire of direct (current supply therefor, means. including a transmitting tracer, controlling the strength ot' the currents traversing the tracer lines, and electro-magnetic pen-moving parts at the receiver controlled by such currents` of a pair of condensgrs connected With said source or" current supply and with the tracer lines and arranged to, alternately charge and discharge in series, one being positively and the other negatively charged, a short-circuit-l rng buzzer group, including a 'nnagaiet connected with the positive and negative 'of said source of current supply and automatically controlling the alternate charging and discharging of said condensers, whereby alter4 nating current Waves are caused to traverse the tracer lines, suitable impedance means for diverting said waves from said current controlling means and said pen -moving parts, and resistances interposed between the buzzer magnet and the positive and negative of the source of current supply.

7. -n a telautographic instrument the variableiciu'rent strength type, the co. i. tion with the tracer vlines connecting transmitter andl receiver, a source of di current supply therefor, means, incl transmitting tracer, controlling the f i of the currents therefrom tl; tracer lines, and electrounag ing parts at the receiver oom ollec by su'. currents, ot a pair olf cond-el connect with said source of current supixily and wi the tracer lines and arranged to alterna l charge and discharge in series. one bf pcsi'tivelyand the other rely cha'nr a short-circuiting buzzer group connes ed with said source of current suppl and automatically controlling the alternate charging and discharging of said conilenscrs, whereby alternating cur-ren `naves are, caused to traverse the tracer lines, and manuaily o eraiole means at the tr smittei confn-)lili the condition, as to .55ct said 'condensers, u

8. ln a telautographic instrument of the variable current strength type, the combinaY tion with the tracer lines connecting the transmitter and receiver, a` source of direct current supply therefor, means, including a transmitting tracer, controlling the strength.

of the :currents therefrom traversing lthe tracer lines, and electro-magnetic pen-Inoving parts at the receiver controlled by such currentsl-of a pair of condensers connected with said source of currentsupply and'with LEF,

iti@

current supply therefor, means, lincluding a transmitting tracer, controlling the strength ofthe currentsl traversing the tracer lines, and elec magnetic pen-moving parts at thereceiver controlled by such currents, ot a pair of 'condensers connected with said source of current supply and with the tracer lines and arranged to alternately charge and discharge in series, one being positively and the-other negatively charged, a short-circuitA ing buzzer group connected with said source of current supply and automatically centi-ob ling the alternate charging and discharging of said condensers, Awhereby alternating current'waves are caused to traverse the tracer lines, suitable impedance means 'for diverting said waves from said current controlling means, and manually operable means at the transmitter controlling the condition, as t activity, of said condense-rs.

10. 1n a tebnitographic instrument of the variable current strength type, the combination with the tracer lines connecting the transmitter and receiver. a. source of direct current supply therefor, means, including a transmitting tracer, controlling thel strength of the currents traversing the tracer lilies, and electro-magnetic pen-moving parts at the receiver controlled by such cin-rents, of a pair of mndensers connected with said source of current sup ply and with the tracer lines and a r; anged to alternately charge and discharge in series, one l. eing\positively and the other negatively cliarged, a short-circuiting` bum/.rr group ci'nnierted with said source, of current siuiply and automatically controlling the alternate charging and dis charging of said coiulenscrs, whereby alter inningA current waves are caused to traverse l :u r lines, suitable impedance means diveutiug said waves troni said current controlling unmus, and tracer operable uiezur; :it the trau-mutter controlling the condiliun.l as to :ufi\.i';f, ol" said Gendt-users.

il. in a tclautographic instrument ot' the ariab'le current strength type, the combinav tion with the tracer .lines cunuectiiig the iran.' nitter and receiver, a source ot' direct current supply therefor. means. including a iransniitting tracer. iifoul'rol lingY the strength l, :di the current (ravin-sing; the tracer lines,

and elect; Jhe receiver ccnrulleil. by such f'u. pair of .a' iior.\,1i;ers cenni-r source of current supply aud n all nts, of a the tracer lines and '.nranr'rd to aliwnatclv charffe und 'J tively and l` shorlwiruroup c with said source oli curre supply and -=fomaticmlly controlling tl` alteruale rlmrf'v" chaining( oiE .aid cruirleufers, who mating current wave:- are cuised tu 1 discharge 1n s. the other n culling the tracer lines. suit-alu' l'or diverting said waves fr u; sind .ur

controlling means and said pen-moving parts, and manually operable means at the transmitter controlling the condition, as to actu. ity, of said condensers.

12,A ln a telautographic instrument of the ariable current strength type, the combination with the tracer lines connecting the transmitter and receiver, a source of direct current supply therefor, means, including a transmitting tracer, controlling the strength of the currents traversing the tracer lines, and electro-magnetic pen-moving parts at thel receiver cvintrollcfjl by such currents, ol a pair of condenscrs connected with said source oli current supply and with the tracer lines and arranged to alternately charge and discharge in series, one being positively and the other negatively charged, a short-circuiting buzzer group connected with said source of current supply and automatically controlling the alternate charging and discharging ofsaid condense-rs, whereby alternating cur rent waves are caused to tra verse the tracer lines, suitable impedance means for diverting said waves from said current contmlling means and said penunoring parts, and tracer operable means at the transmitter controlling the condition, as to activity, of said condcnsers.

llLfIn a tclautographic instrument of the variable current strength type, the combi nation with the tracer lines connecting the discharge in series, one being positively and the other negatively charged, a slmrtrirruitiug buzzer group, including a magnet connected with the positif,` a and ne'ative of uuid source of current supply and automatically controiung thealtermite charging and discharging of said condensers. vvhmwby all'eriiating current wav are caused to lrz'ivrrse the tracer lines, suitable inniedance means for diverting said waves from said current controllingl means and said penmoving parts, r tance interposed between the buzzer magnet and the positive and negative of the source of current supply, and manually operable means at the trans-- l 'eter controlliingj the condition. as to ac-- ot' .said cmzdeiuecrs, sani coudensm's, ,ffl-cup, impedance nnans and resist aurrs lli-no3 n :arranged and propfutioned irlalivrly lo ach other and to the tra Aer lines as to p; le in ihr latter a balaured "o-uliiiou nl: circuit vviulifz' the ennuh-users he active or inactive.

,lv-l, ln :1 tulantographic instrulnre'it of the n', (nel variable current strength type, the cornhination with the tracer lines connecting the transmitter and receiver, a source et direct current supply therefor, means, including a transmitting tracer, controlling/the strengtl.

ot' the currents traversing the tracer lines, and'electromagnetic pen-moving parte at the receiver controlled by such currents, et a pair of condensers connected with said source ot current supply and with the tracer lines and arrangedftgnlternately charge and discharge in series, one being positively and the other negatively charged, shertci"cuit ing buzzer group, including a magnet connceted with the positive and negative of said source ot current supply and automiitically controlling'the alternate charging and discharging of said condenser-s, nl'iereliy alternating,r current wares are caused to trav crse the tracer lines, suitable i `'iedance means vfor diverting said wares from said current controlling means and said pen-moving parts, rcsistances interposed between the buzzer magnet and the positive and negative et the source ot' current supply, and tracer operahlc means at the transmitter controlling" the condition, as to actiifity, et said cundeuscrs, and said condensers, buzzer group,

impedance means and re'sistances being arranged and proportioned relativel7 to each other and to the ltacer lines as to provide in the latter a balanced condition of circuit Whether the condensers be active or inactive.

'15. In a telautographic instrument of the variable current strength type, the cornbination with the tracer lines connecting the transmitter and receiver, a source ot direct current supply therefor,means, 'including a transmitting tracer, controlling the strength of 'the currents therefrom traversing the tracer lines, and electr-canagnetic pen-moving parts at the receiver controlled by such currents, ot a pair ot condensers connected with said source orp rent supply and the' the tracer lines arranged to alternately charge and discharge in series, une being positively and the other negativelycharged, a short-circuiting buf/.zer group connected with said source et current supplyjand automatically controlling the alternate charging and discharging of said condensers, whereby alter`- nating current wares are caused to traverse the tracer lines, tracer opera-ble means controlling the condition, as to activity, ot said and 'condensers, and electro-magnetic devices controlled in theiroperation by said Waves and in turn 'controlling the movement of `the receiving pen to and :tromits Writing platen.

16. in a telautographic'instrument of the variable current strength type, the combination with the tracer lines connecting the transmitter and receiver, a source of direct cur- Y current supply therefor, means,including e transmitting tracer, controlling the strength et the currents traversing the tracer lines, and electro-magnetic pen-moving parts the receiver controlled by such currents, et

a, pair condensers connected with said source oi current supply and With the tracer lines and arranged to alternately charge and discharge in series, one being 1iositively and the'otuer negatively charged, slior-t-ciiciiiting buzzer group connected with said source of current supply and automatically controlling the alternate charging and discharging of said condensers, whereby alternating current Waves are caused to traverse the tracer lines, suitable impedance means for. diverting said Waves from said current controlling means, tracer operable means controlling 'the condition, to tirity, of said condenser-s, and electro-inagnetic de 'ices controlled in their operation by said Wares and in turn controlling the movement of the receiving pen to and from its writing platen.

i7, fn a. telautograpliic instrument of the variab" current strength type, the eombination with the tracer' lines connecting 'the transmitter and receiver, a source et direct current supply therefor; means, including a transmitting tracer, controlling the strength the currents traversing the tracer lines` and electro-magnetic pen-moringj parts at the receiver controlled by such. currents, pair of condensers connected with source current supply and with the tracer lines and arranged to alternatelp7 charge and discharge in series, one beingr nositivelj,7 and the other negativelycharged, a short-circuit ing buzzer group connected vith said source of currentsupply` and automatically controli f ling,` the alternate charging and discharging ot said condensers, wherehjrjiIv alternating lcur-- rent Wares are caused to traverse the tracer lines, suitable impedance means for diverting said Waves 'from said current controlling means and said pen-moving parts, tracer op crable means controlling the condition, as to activity. of said eondeusers.l and electromagnetic devices controlled in their operation by said Waves andin turn cont-rolling the movement of thereceiving pen to and from its writing platen.

ld. ln a telautographic instrument of the: variable current strength type, the combination with the tracer lines connecting,Y the transmitter and receiver, a sourceof direct current supply therefor, means, including a transmitting tracer, controlling the strength of the currents therefrom traversing the tracer lines,l and electro-magnetic pen-moving parts at the -receiver controlled by such currents, of apair of., cndensers connectedY with said source oli current sur ply and vith the tracer lines and arranged to alternately charge and discharge in seH v no ries, one being positively and the other negatively charged, a short-.circuiting buzzer group connected with, said source of current supply and automatically controlling the alternate charging and discharging of said condensers, whereby alternating current Waves are caused to traverse the tracer lilies, tracer operable means controlling the condition., as to activity, of said condensers, electromagnetic devices controlling the nievement of the receiving pen to and from its writing platen, a circuit therefor including a pair of relatively loose contacts, and a relay bridged with a condenser a'cross the tracer lines at the receiver' and allected by 4the alternating current Waves traversing the tracer lines and in Aturn vibrating the relatively nloose contacts so as to break the circuit of which they form a part.

19. In a tela'utographic instrument of thevariable current strength type, the comblnation with the tracer lines connecting the transmitter and receiver, a source of direct `current supply therefor, means, including a transmitting tracer, controlling the strength of the currents traversing the tracer lines, and electro-magnetic pen-moving parts at the receiver controlled by such currents, of a pair of condensers connected with said source'of current supply and with the tracer lines and arr'anged to alternately charge and discharge in series, one being positively and the other negatively charged, a short circuiting buzzer group connected with said source of current supply and automatically controlling the alternate charging and discharging of said condensers, whereby alternating current Waves are caused to' traverse the tracer lines, suitable impedance means for diverting said Waves lfrom said current controlling means, tracer operable means controlling the-condition, as to activity, of said condensers, electro-magnetic devices controlling the movement of the receiving pen to and from its Writing platen, ai circuit therefor, including a pair oiE relatively loose contacts, and a relay bridged with a condenser across the tracer lilies at the receiver and affected by the alternating current traversing the tracer lines and in turn vibrating the relatively loose contacts as to break the circuit of which they form a part. i

2f). In a telautegraphic instrument of the variable current strength type, the combination with the tracer lines connecting the transmitter and receiver, a source of direct current supply therefor, means, including a transmitting tracer, controlling the strength of the currents traversing the tracer lines, and electro-magnetic pen-moving parts at the receiver controlledby'` such currents, of a pair of condensers connected with said source of current supply and with the tracer lines and arranged to alternately charge and discharge in series, one being positively and the other negatively charged, a short circuiting buzzer group connected with said source of current supply and automatically controlling the alternate charg ing and discharging of said condensers, whereby alternating current Waves are caused to traverse the tracer lines, suitable impedance means for diverting said Waves from said current controlling means and said pen-moving parts, tracer operable means controlling the condition, as to4 activity, of said condensers, electro-magnetic devices controlling the movement of the receiving pen to and from its Writing platen, a circuit therefor, including a pair of relatively-loose contacts, and a relay bridged `with a condenser across the tracer lines at the receiver and affected by the alternating current Waves traversing the tracer lines and in turn vibrating the relatively loose being positively and the other negatively charged, a short-circuiting buzzer group connected with said source of current supply and automatically controlling the alternate charging and discharging of said condensers, whereby alternating current waves are caused to traverse the tracer-lines, suitable impedance means for diverting said waves from said current controlling means and said pen-moving parts, tracer operable means controlling the condition as to activity, of said condensers, and electro-magnetic devices controlledin their o eration by said Waves and in turn contro ling thejmovement of the receiving pen to and from its4 writing platen, said condensers, buzzer roup, impedance means, and resistances 'eng so arranged, and proportioned relatively to each other and to the tracer lines as to provide in the latter a balanced condition of circuit whether the condensers be active or inactive.

izo

and electro-magnetic pen-1noving parts at the receiver controlled by such currents, of a pair of condensers connected with said source of current supply and'with the tracer 'lines and arranged to alternately charge and `discharge in series, one being positively and the other negatively charged, a short cir-f' cuiting,` buzzer group connected With said source of current supply and automatically controlling the alternate charging and discharging of said condensers, whereby alternating current Waves are caused to traverse the tracer lines, suitable impedance means ior diverting sald Waves from said current controllino` means and said en-movin cluding a pair of relatively loose contacts, and a relay bridged with a condenser across the tracer lines at the receiver and affected by the alternating current waves traversing the tracer lines and in turn vibrating the relatively loose contacts so as to break the circuit of which they forni a part, said condensers, buzzer group, impedance means, and resistances being so arranged and proportioned relatively to each other and to the tracer lines as to provide in the latter a balanced condition of circuit whether the condensers be active or inactive.

In testimony whereof, I have hereunto set my hand, in the presence of two subscribing witnesses.

HENRY W'. ONEILL. Vfitnesses:

J. F. DONOVAN, T.' F. KEHOE. 

